Standing desk



FIG. 1 is a top front perspective view of a standing desk, showing my new invention;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is left side view thereof.

The broken lines shown in the drawings illustrate portions of the standing desk that form no part of the claimed design. 

CLAIM The ornamental design for a standing desk, as shown and described. 